Answer
The configurations around the asymmetric carbons of (R) - cysteine and (S) - alanine are the same. The position of configuration changes because sulphur changes the priorities of the side chain and -COOH group.
Work Step by Step
The configurations around the asymmetric carbons of (R) - cysteine and (S) - alanine are the same. The position of configuration changes because sulphur changes the priorities of the side chain and -COOH group.